<!DOCTYPE html>
<html>
<head>
  <script src="https://cdn.rawgit.com/konvajs/konva/1.4.0/konva.min.js"></script>
  <meta charset="utf-8">
  <title>Konva Event Delegation Demo</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      overflow: hidden;
      background-color: #F0F0F0;
    }
  </style>
</head>
<body>
  <div id="container"></div>
  <script>
    var stage = new Konva.Stage({
      container: 'container',
      width: 300,
      height: 300
    });

    var layer = new Konva.Layer();

    var star = new Konva.Star({
      x: stage.getWidth() / 2,
      y: stage.getHeight() / 2,
      numPoints: 15,
      innerRadius: 40,
      outerRadius: 70,
      fill: 'blue',
      scale: {
        x: 2,
        y: 0.5
      },
      name: 'my star'
    });

    layer.on('click', function(evt) {
      // get the shape that was clicked on
      var shape = evt.target;
      alert('you clicked on \"' + shape.getName() + '\"');
    });

    layer.add(star);

    // add the layer to the stage
    stage.add(layer);
  </script>

</body>
</html>